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Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A078254 as a simple table

na(n)
10
21
33
46
510
615
721
828
936
1045
1155
1266
1378
1491
15171
16595
17666
185050
195151

[0,1,3,6,10,15,21,28,36,45,55,66,78,91,171,595,
 666,5050,5151]